Summary: Encoding Requests to Web Service
Compositions as Constraints
Alexander Lazovik1,2
, Marco Aiello1
, and Rosella Gennari2
1
DIT, Trento U., via Sommarive 14, 38050 Trento, IT,
{lazovik,aiellom}@dit.unitn.it
2
ITC-irst, via Sommarive 18, 38050 Trento, IT, gennari@itc.it
Abstract. Interacting with a web service enabled marketplace in order
to achieve a complex task involves sequencing a set of individual service
operations, gathering information from the services, and making choices.
We propose to encode the problem of issuing requests to a composition
of web services as a constraint-based problem.
1 Introduction
Services are autonomous computational entities which live on a network and
interact by asynchronous message passing. Services publish standard interfaces
to enable their discovery, binding and invocation. The most prominent exam-
ple is given by the XML-based standards known as web services, and the most